const userAgent = window.navigator.userAgent.toLowerCase(); // https://youtrack.weseek.co.jp/issue/GW-4826 const isOldIos = /(iphone|ipad|ipod) os (9|10|11|12)/.test(userAgent); /** * Apply 'oldIos' attribute to */ function applyOldIos() { if (isOldIos) { document.documentElement.setAttribute('old-ios', 'true'); } } export { // eslint-disable-next-line import/prefer-default-export applyOldIos, };